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Journal of the Optical Society of America B

Laser cooling and electromagnetic trapping of neutral atoms

William D. Phillips, John V. Prodan, Harold J. Metcalf

Published Nov 1, 1985• 175 citations
Publisher

Abstract

Atoms in a thermal beam can be cooled, decelerated, and stopped using the radiation pressure from a nearly resonant laser beam. Several groups have already used this laser-cooling process on an atomic sodium beam. The techniques and results of the various experimental groups are reviewed, and applications of laser-cooled atoms, in particular the possibility of confining them in electromagnetic traps, are discussed.

DOI
10.1364/josab.2.001751

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Techniques to slowand t rap neutral atoms at high d ensities with r adiative forces are discussed in this review article. It isshown that the radiative force on an atomic system has two components, one coming from the rnomentum transferred from the photon to the atom and the other resul ting f rom the interaction of the transi t ion d i po 1 e mo- ment with the radiation field gradient. Among several methods of laser cooling, we emphasize Zeeman tuning of the electronic l evels and fre- quency-sweeping techniques. Trapping of neutral atoms is ano ther i n- teresting subject discussed in this review. We present recent resul ts obtained in light and magnetic traps. Finally, techniques to f urther c001 atoms inside traps a re presented and the future of laser cool i ng of neutral atoms by means of radiation pressure is discussed.

•Jan 1, 1988•1 citation
Atoms in a thermal beam can be cooled, decelerated, and stopped using the radiation pressure from a nearly resonant laser beam. Several groups have already used this laser-cooling process on an atomic sodium beam. The techniques and results of the various experimental groups are reviewed, and applications of laser-cooled atoms, in particular the possibility of confining them in electromagnetic traps, are discussed.
A thermal atomic Na beam is opposed by a resonantly tuned laser beam. The radiation pressure decelerates and compresses the thermal velocity distribution, bringing the average velocity to zero and reducing the width from ~1000 m/s to a few tens of m/s or less.1 The density of stopped atoms is > 106/cm3 within a bandwidth of a few m/ s. These densities and velocities are suitable for trapping by a number of proposed optical and magnetic traps. Using these stopped atoms, we have demonstrated the first electromagnetic trapping of neutral atoms. The trap, a magnetic quadrupole formed by two separated, coaxial, opposed current loops, confines the atoms by virtue of the force exerted on the Na magnetic dipole moment by the inhomogeneous magnetic field. The time constant for exponential decay of the atomic population in the trap is 0.83(7) s and is limited mainly by collisions with fast background gas atoms. The maximum velocity of atoms contained in the trap is 3.5 m/s, corresponding to a maximum energy of 17 mK.
Techniques to slowand t rap neutral atoms at high d ensities with r adiative forces are discussed in this review article. It isshown that the radiative force on an atomic system has two components, one coming from the rnomentum transferred from the photon to the atom and the other resul ting f rom the interaction of the transi t ion d i po 1 e mo- ment with the radiation field gradient. Among several methods of laser cooling, we emphasize Zeeman tuning of the electronic l evels and fre- quency-sweeping techniques. Trapping of neutral atoms is ano ther i n- teresting subject discussed in this review. We present recent resul ts obtained in light and magnetic traps. Finally, techniques to f urther c001 atoms inside traps a re presented and the future of laser cool i ng of neutral atoms by means of radiation pressure is discussed.